Vscode debugger ignores breakpoints in imported modules
It was my fault.
The wrong module path in import function &quot;pakage.module&quot; instead of &quot;.package.module&quot; (the dot at the beginning) was the reason.
I didn't know that addon is copied into the blender scripts folder and then debugged.
My disorientation was caused by fact that the addon was fully functional with those mistakes.
I am still learning. Thanks, everyone.